Fire up your new machine and let the migration assistant dot the copying. I don't think it matters which of the two backups you use to copy from, the assistant will copy your old settings as much as possible. I don't think it's a good idea to clone your CCC disk to your new air.

A clone from an older MBP will almost certainly not work on a new MBA. New MBAs ship with custom version of Lion, and you can't install anything prior to that. New drivers are required for Thunderbolt and the GPU.

I guess you can use the CCC clone as long as you do it with the migration assistant. Be sure to migrate only the bootable clone without archives.
If you copy the clone to your new mac with CCC there will be files missing that are vital for the newer machine.

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